What $100K really buys
After federal + average state taxes (~22% effective), $100K becomes ~$78K take-home. Saving 20% of gross ($20K) leaves $58K to live on — comfortable in most US metros, tight in HCOL cities like SF/NYC/Boston.
After 25 years of $20K/yr at 7%, you'll have ~$1.35M — enough to support $54K/yr of withdrawals (4% rule), close to your current take-home. Add Social Security and you're set.
